Formawork for starter walls



Get. 21, 1969 BLONDE FORMWORK FOR STARTER WALLS Filed Dec. 9, 1966 Ann 7rm. c1. ritm 11/08 11.5. Cl. 249-19 6 Claims ABSTRACT OF THE DISCLOSUREA starter formwork for casting a starter wall in one operation togetherwith a structure produced by casting concrete into the space betweenshutterings of a main formwork, comprising at least one end remberadapted to engage a shuttering of the main formwork for support thereon,and at least one side member releasably supported by the end member. Theend member includes a surface which defines an end face of the starterwall to be produced and inclined for ready release from the hardenedconcrete. The side member has a surface defining a lateral surface ofthe starter wall, and the end member and the side member extend to alevel corresponding to the height of the starter wall.

The present invention relates to an improvement in formwork for starterwalls, that is to say, formwork adapted to establish a small starterwall which has a height of a few centimeters and to which a mainformwork is to be secured for casting the final wall.

Such a method of construction has already been described elsewhere, anda formwork has become known thereby which can be dismantled and which isconstituted of shells or shutterings which permit walls and an upperfioor to be cast in one operation. In this method, a starting forrnworkmust be placed in position before the main formwork is erected, and awall base or starter wall is produced therewith which has a thickness ofa few centimeters and the same length as the final wall. The mainformwork is attached to the starter wall after the concrete hashardened, and is correctly held in position thereby.

These starter walls are produced by means of special shutter members,for example angle members which are interconnected by means of couplingbars which permit them to be located accurately. The starter formworkcannot be placed in position until the walls and fioor on which it is tobe used have set and hardened. Thereafter the starter wall must be castand a new waiting period must elapse before the setting and hardeningthereof are assured. Consequently valuable time is lost during theconstruction for the simple operation of producing these small starterwalls.

The present invention is directed to avoiding this disadvantage bycasting the starter walls in one operation together with the casting ofthe wall and floor.

It is one object of the present invention to provide a starter formworkfor casting a starter wall in one operation together with a structureproduced by casting concrete into the space between shutterings of amain formwork, the starter formwork comprising at least one end memberadapted to engage a shuttering of the main formwork for support thereon,and at least one side member releasably supported by the end member, theat least one end member having a surface which defines an end face ofthe starter Wall to be produced and which is inclined for easy releasefrom the hardened concrete and the at least one side member having asurface defining a lateral surface of the starter wall, the at least oneend member and nited States Patent the at least one side memberextending to a level corresponding to the height of the starter wall.

It is another object of the present invention to provide a starterformwork comprising an end member having the general shape of a wedgeprovided with shoulders for resting on the upper edge of a shuttering ofthe main formwork and for receiving the side members, the latter beingmaintained in contact with the end member by a rod extending through theside members and the end member.

It is still another object of the present invention to provide a starterformwork wherein the lower portion of the end member has a recess whichis large enough to permit reinforcement bars of the wall and the floorto pass therethrough and thu to permit the end member to be placed inposition and extracted again.

With these and other objects in View, which will be come apparent in thefollowing detailed description. the present invention will be clearlyunderstood in connection with the accompanying drawing in which:

FIGURE 1 is a vertical cross-section through a starter formwork for awall from the two sides of which floors extend;

FIG. 2 is a vertical cross-section through the starter formwork for anend wall with one floor extending therefrom; and

FIG. 3 is a sectional view of the end member with two angle membersresting thereon.

The starter formwork is constituted by an end member 1 and two sidemembers, such as angle members 2 and 3 as shown in FIG. 1.Alternatively, the starter formwork may be constituted by an end member11 and one angle member 12 as shown in FIG. 2. The end member 1 is usedfor a party wall, that is to say, a wall from which floors extend onboth sides. The end member 11 is used for an end wall, such as a gablewall; that is a wall from which only one floor extends on one sidethereof.

The end member 1 generally has the shape of a downwardly directed wedgeand is provided on both sides with projections 4 and 5 which do notextend over the whole height of the packing member. The projections 4and 5 have. shoulders with horizontal upper surfaces 6 and lowersurfaces 7. The member 1 is intended to be supported by the engagementof the surfaces 7 with the upper portions or edges of shutterings 8 of amain formwork, whereas the lower lateral faces of the end member restagainst the upper portion of the vertical surfaces of the shutterings 8.The vertical flanges of the angle members 2 and 3 rest against the upperlateral surfaces of the end member 1 and the horizontal surfaces of theangle members 2 and 3 engage the upper surfaces 6. The height of theprojections 4 and 5 corresponds exactly to the thickness of the floor tobe cast. The dimensions of the upper surfaces 6 and the upper lateralsurfaces of the end members 1 are selected so that the angle members 2and 3 can be located thereon as accurately as possible. The anglemembers are held on the end members 1 by tie rods or bolts 9 whichextend through holes in the angle members and through holes 10' providedin the upper portion of the end members 1.

The end member 1 generally has the shape of a wedge, that is, it istapered in order to facilitate its extraction. In particular the surfacein contact with the concerte and defining the end face of the starterwall is inclined for easy release from the hardened concrete. Theprojections 4 and 5 also have a downwardly directed taper.

T be lower portion of the end members 1 or 11 is provided with a recess13 which permits the passage therethrough of reinforcing bars of thewall and of the floor and permits the end member to be placed inposition and extracted again without undue difliculty.

The end members 1 or 11 may be manufactured in a single solid piece, butit is preferable to produce it by welding from plate material so that itis hollow and light. In this latter case it will be necessary to closethe internal faces of the recess 13 so as to avoid an ingress of castconcrete into the interior of the packing member; preferably the sameapplies to the external portion of the packing member and in particularto the surfaces 6 and 7.

The end member 1 is intended for a party wall, that is a wall form whicha floor extends on each side. In the case of an end wall (FIG. 2), theend member 11 has the same structure as the end member 1 except that ithas only one projection 5. The end member 11 is supported on a singleshuttering 8 and it supports a single angle member 12. An outer member14 of another shuttering is in engagement with the entire other side ofthe end member and extends to the same level as the upper portion of thelatter and of the angle member 12.

In order to use this formwork when the shutterings of the main formworkare already in position, the end members 1 or 11 are distributed asrequired, the angle members 2 and 3 or 12 are placed in position and areaflixed to the end members by means of the tie rods 9. Thereafter theconcrete is cast in the normal manner'as practiced heretofore, in orderto produce a wall between two shutterings and a floor above therespective shuttering. When the floor has been cast to the requiredthickness, at little additional concrete is cast between the anglemembers 2 and 3 or between the angle member 12 and the shuttering member14, so that the concrete is level with the upper portion of the anglemembers or the shuttering member.

The starter wall is thus constituted. In view of its small height whichis a few centimeters and frequently less than centimeters, itshydrostatic pressure is low and the high viscosity of the concreteprevents the latter from flowing away from the starter wall towards thefloor or floors. The starter wall sets and hardens at the same time asthe walls and the floors. Consequently the construction of this starterwall requires no time additional to the time necessary for the settingand hardening of the walls and the floor.

It may be seen that in this way appreciable time is gained during theconstruction.

I claim:

1. A starter formwork for casting concrete starter walls simultaneouslyin one operation with structural members produced by casting concrete inthe space between shutterings of a main formwork, comprising:

at least one side member means defining at least one lateral surface ofa starter wall,

at least one end member means for defining an end face of said starterWall,

means for releasably supporting said at least one side member means onsaid at least one end member means,

said at least one end member means having means for engaging ashuttering, said at least one end member means formed with a taperingsurface adjacent said concrete to be hardened for easy release from saidhardened concrete, and

said side member when supported on said at least one end member meansand said end member having a height corresponding to the height of thestarter Wall to be produced.

2. The starter formwork, as set forth in claim 1. wherein said at leastone side member means comprises two angle members,

said supporting means for supporting said two angle members in spacedrelation, and

said two angle members and said at least one end member means defining aspace equal to the width of the starter wall to be produced.

3. The starter formwork, as set forth in claim I, wherein:

said at least one side member means and said at least one end membermeans are adapted to be placed in spaced relation to a shuttering ofsaid main formwork to define between them a space equal to the width ofthe starter wall to be produced.

4. A starter formwork for casting concrete starter walls simultaneouslyin one operation with walls and floors cast between shutterings of amain formwork, comprising at least one end member means,

two side members releasably supported in spaced apart relationship bysaid at least one end member means and having a height in the supportedposition cor responding to the height of the starter wall to beproduced,

said at least one end member means including means for resting on theupper portion of the shutterings, and

said at least one end member means including a tapering surface tofacilitate release thereof from the hardened concrete.

5. The starter formwork, as set forth in claim 4. wherein said at leastone end member means is substantially wedge-shaped, said resting meanscomprises flanges on said at least one end member means for resting onthe edges of said shutterings and for receiving said side members, and

tie rods extending through said two side members and said at least oneend member means for releasably holding said two side members inengagement with said at least one end member means.

6. The starter formwork, as set forth in claim 4, wherein said at leastone end member means is formed at the lower portion thereof with arecess which permits reinforcement bars of a wall and floor member toextend therethrough so that said at least one end member means can beplaced in position and re moved again.

References Cited UNITED STATES PATENTS 2,658,252 11/1953 Avril 249--39 X2,930,096 3/1960 Haber 249-16 2,575,678 11/1951 Olson 249-19 X 3,376,0104/1968 Myer 249l3 I. SPENCER OVERHOLSER, Primary Examiner J. S. BROWN,Assistant Examiner US. Cl. X.R. 24934

